﻿using System;
using System.Xml;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
/// <summary>
/// RSA密钥格式转换
/// </summary>
public class RSAKeyConvert
{
    /// <summary>    
    /// RSA私钥格式转换，java->.net    
    /// </summary>    
    /// <param name="privateKey">java生成的RSA私钥</param>    
    /// <returns></returns>   
    public static string RSAPrivateKeyJava2DotNet(string privateKey)
    {
        RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
        return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
        Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
        Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
         Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
    }
    /// <summary>    
    /// RSA私钥格式转换，.net->java    
    /// </summary>    
    /// <param name="privateKey">.net生成的私钥</param>    
    /// <returns></returns>   
    public static string RSAPrivateKeyDotNet2Java(string privateKey)
    {
        XmlDocument doc = new XmlDocument();
        doc.LoadXml(privateKey);
        BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
        BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
        BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
        BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
        BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
        BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
        BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
        BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));
        RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
        PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
        byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
        return Convert.ToBase64String(serializedPrivateBytes);
    }
    /// <summary>    
    /// RSA公钥格式转换，java->.net    
    /// </summary>    
    /// <param name="publicKey">java生成的公钥</param>    
    /// <returns></returns>    
    public static string RSAPublicKeyJava2DotNet(string publicKey)
    {
        RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
        return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
            Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
            Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
    }
    /// <summary>    
    /// RSA公钥格式转换，.net->java    
    /// </summary>    
    /// <param name="publicKey">.net生成的公钥</param>    
    /// <returns></returns>   
    public static string RSAPublicKeyDotNet2Java(string publicKey)
    {
        XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey);
        BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
        BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
        RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
        SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
        byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
        return Convert.ToBase64String(serializedPublicBytes);
    }
}